One semester, i collected data from my students. it turned out that the correlation between their heights and hand spans was about 50%. the average height was about 67 inches, with an sd of about 3 inches, while the average hand span was about 7 inches, with an sd of about 1 inch. the scatter plot turned out to be football-shaped. what would be the regression estimate of the hand span of a student who is 73 inches tall?